Quadrulella (quad-roo-lell-a) is a testate amoeba. The pyriform shell is composed of quadrangular, non-overlaping siliceous scales. Each scale measures on average 7 X 7 microns. The shell of this dead specimen is filled with transparent quadrangular siliceous scales, built by the cell in his or her lifetime. Differential interference contrast. This picture was taken by Martin Kreutz using an Olympus microscope. Image copyright: Martin Kreutz, image used under license to MBL (micro*scope).
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From the collection
Freshwater ponds of Konstanz (Germany)
|Description of Quadrulella symmetrica: Testate amoeba, of which the lorica is is colourless, ovoid or pyriform and composed of quadrangular, siliceous shell plates. It is compressed laterally especially in the region of the aperture. The shell plates are usually arranged in a regular arrays, often in rows, with smaller plates close to the aperture. The aperture is oval, often concave when viewed from the side, and it is surrounded by a thin collar of organic cement. Tests are 68-120 microns long, 36-74 microns wide, and 27-35 microns deep, with an aperture that is 18-22 microns wide. |